The retr.c:fd_read_body() function is called when processing OK responses. When the response is sent chunked in wget before 1.19.2, the chunk parser uses strtol() to read each chunk's length, but doesn't check that the chunk length is a non-negative number. The code then tries to read the chunk in pieces of 8192 bytes by using the MIN() macro, but ends up passing the negative chunk length to retr.c:fd_read(). As fd_read() takes an int argument, the high 32 bits of the chunk length are discarded, leaving fd_read() with a completely attacker controlled length argument. The attacker can corrupt malloc metadata after the allocated buffer.
References
Link | Resource |
---|---|
http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bba | Issue Tracking Patch Third Party Advisory |
http://www.debian.org/security/2017/dsa-4008 | Issue Tracking Third Party Advisory |
http://www.securityfocus.com/bid/101590 | Issue Tracking Third Party Advisory VDB Entry |
http://www.securitytracker.com/id/1039661 | Issue Tracking Third Party Advisory VDB Entry |
https://access.redhat.com/errata/RHSA-2017:3075 | |
https://security.gentoo.org/glsa/201711-06 | Issue Tracking Third Party Advisory |
https://www.synology.com/support/security/Synology_SA_17_62_Wget | |
https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html | Issue Tracking Patch Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: certcc
Published: 2017-10-27T00:00:00
Updated: 2017-12-29T13:57:02
Reserved: 2017-08-22T00:00:00
Link: CVE-2017-13090
JSON object: View
NVD Information
Status : Modified
Published: 2017-10-27T19:29:00.377
Modified: 2017-12-30T02:29:01.187
Link: CVE-2017-13090
JSON object: View
Redhat Information
No data.